9. Charles and David Koch

itles: CEO (Charles) and executive VP (David), Koch Industries

Country: US

Ages: 80 (Charles), 75 (David)

Billionaire brothers Charles and David Koch run multifaceted conglomerate Koch Industries, the second-largest private company in America. Outspoken in the world of conservative politics, the Koch brothers, who have a combined net worth of $87 billion, wield a heavy influence over the upcoming 2016 presidential race. The two have publicly announced they're considering backing Republican candidate and former HP CEO Carly Fiorina for president. But they, along with their vast donor network, plan on pitching in a total of $889 million during the 2016 election cycle.

Though politically divisive, the brothers' business success is undeniable. The company employs 100,000 people and generates $115 billion in sales from its diverse company, which makes everything from petrochemicals and Dixie Cups to raw clothing materials.